Abstract The synthesis and 119m Sn Mössbauer spectra of 114 complexes of the type R 2 SnX 2, L 2 (R Me, Et, n-Pr, n-Bu, n-Oct, Ph, Bz; X F, Cl, Br, I, NCS; L 2 2 monodentate or 1 bidentate O-or N-donor ligand (s)), 74 of which are new, are reported. The majority of the complexes are isostructural, having an octahedral trans-R 2 SnX 4 geometry about tin, whilst five of the diphenyltin complexes (R Ph; X Cl; L 2 AMP, Nphen; X NCS; L 2 bipy, ...